public static DateTime FirstTradingDateOfTheMonth(this WealthScript obj, DateTime date) {
            date = Convert.ToDateTime(date.Month + "/1/" + date.Year); // First day of the month
            date = obj.TradingDateOnOrAfter(date); // Trading date on or after the first day of the month
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.FirstTradingDateOfTheMonth(currentDate);
         */
        public static DateTime FirstTradingDateOfTheWeek(this WealthScript obj, DateTime date) {
            date = date.AddDays(-(int)date.DayOfWeek); // Sunday of the week
            date = obj.NextTradingDate(date); // Next trading date
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.FirstTradingDateOfTheWeek(currentDate);
         */
        public static DateTime FirstTradingDateOfTheYear(this WealthScript obj, DateTime date) {
            date = Convert.ToDateTime("1/1/" + (date.Year)); // First day of the year
            date = obj.TradingDateOnOrAfter(date); // Trading day on or after the first day of the year
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.FirstTradingDateOfTheYear(currentDate);
         */
        public static DateTime LastTradingDayOfTheMonth(this WealthScript obj, DateTime date) {
            date = Convert.ToDateTime(date.AddMonths(1)); // Day of the next month
            date = obj.FirstTradingDateOfTheMonth(date); // First trading date the next month
            date = obj.PreviousTradingDate(date); // Previous trading day
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.LastTradingDayOfTheMonth(currentDate);
         */
        public static DateTime LastTradingDateOfTheWeek(this WealthScript obj, DateTime date) {
            date = date.AddDays(7 - (int)date.DayOfWeek); // Saturday of the week
            date = obj.PreviousTradingDate(date); // Previous trading date
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.LastTradingDateOfTheWeek(currentDate);
         */
        public static DateTime LastTradingDayOfTheYear(this WealthScript obj, DateTime date) {
            date = Convert.ToDateTime("12/31/" + (date.Year)); // Last day of the next year
            date = obj.TradingDateOnOrBefore(date); // Previous trading date
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.LastTradingDayOfTheYear(currentDate);
         */
        public static DateTime NextTradingDate(this WealthScript obj, DateTime date) {
            bool tradingDay = false; // Set this to false initially
            while(tradingDay == false) { // As long as it is not a trading day
                date = date.AddDays(1); // add one day
                tradingDay = TradingDay(obj, date); // Check to see if it is a trading day
            }
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.NextTradingDate(currentDate);
         */
        public static DateTime PreviousTradingDate(this WealthScript obj, DateTime date) {
            bool tradingDay = false; // Set this to false initially
            while(tradingDay == false) { // As long as it is not a trading day
                date = date.AddDays(-1); // subtract one day
                tradingDay = TradingDay(obj, date); // Check to see if it is a trading day
            }
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.PreviousTradingDate(currentDate);
         */
        public static DateTime TradingDateOnOrAfter(this WealthScript obj, DateTime date) { // Returns the first trading day which is on or after the date
            if(!obj.TradingDay(date)) // It is not a trading day,
                date = obj.NextTradingDate(date); // get the next trading date
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.TradingDateOnOrAfter(currentDate);
         */
        public static DateTime TradingDateOnOrBefore (this WealthScript obj, DateTime date) { // Returns the first trading day which is on or after the date
            if(!obj.TradingDay(date)) // It is not a trading date,
                date = obj.PreviousTradingDate(date); // get the previous trading date
            return date;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        DateTime newDate = this.TradingDateOnOrBefore(currentDate);
         */
        public static bool TradingDay (this WealthScript obj, DateTime date) {
            bool tradingDay = !obj.Bars.MarketInfo.Holidays.Contains(date); // The day is not in the list of holidays
            if(tradingDay // It is a trading day
                && (date.DayOfWeek == DayOfWeek.Saturday // and it is a Saturday
                || date.DayOfWeek == DayOfWeek.Sunday)) // or a Sunday
                tradingDay = false; // It is not a trading day
            return tradingDay;
        }
        /* Wealth-Lab code example
        DateTime currentDate = Convert.ToDateTime("1/1/2000");
        Bool tradingDay = this.TradingDay(currentDate);
         */